[mjgreeley909]

Which answer below best describes all atoms of a particular element?
a. they possess the same number of electrons, the same atomic number, the same mass, but nothing else in common
b. they possess the same mass and the same chemical properties, but nothing else in common
c. they possess the same number of electrons, the same atomic number, the same
chemical properties, but not necessarily the same mass
d. they possess the same chemical properties and the same mass, but nothing else in common
e. they possess the same atomic number and the same mass, but have nothing else in common

The set below featuring one alkali, one alkaline earth, one halogen, one lanthanide and one
actinide element is:
a. cesium, barium, bromine, erbium, samarium
b. francium, beryllium, iodine, terbium, berkelium
c. lithium, manganese, fluorine, lanthanum, vanadium
d. potassium, radium, iodine, lutetium, platinum
e. rubidium, strontium, chlorine, thorium, plutonium